usb: gadget: at91_udc: port linux driver at91_udc
port at91_udc driver from linux:
original commit Message:
commit c94e289f195e0e13cf34d27f9338d28221a85751
Author: Arnd Bergmann <arnd@arndb.de>
Date: Sat Apr 11 00:14:21 2015 +0200
usb: gadget: remove incorrect __init/__exit annotations
A recent change introduced a link error for the composite
printer gadget driver:
`printer_unbind' referenced in section `.ref.data' of drivers/built-in.o: defined in discarded section `.exit.text' of drivers/built-in.o
Evidently the unbind function should not be marked __exit here,
because it is called through a callback pointer that is not necessarily
discarded, __composite_unbind() is indeed called from the error path of
composite_bind(), which can never work for a built-in driver.
Looking at the surrounding code, I found the same problem in all other
composite gadget drivers in both the bind and unbind functions, as
well as the udc platform driver 'remove' functions. Those will break
if anyone uses the 'unbind' sysfs attribute to detach a device from a
built-in driver.
This patch removes the incorrect annotations from all the gadget
drivers.
Signed-off-by: Heiko Schocher <hs@denx.de>
diff --git a/drivers/usb/gadget/at91_udc.h b/drivers/usb/gadget/at91_udc.h
new file mode 100644
index 0000000..2679c8b
--- /dev/null
+++ b/drivers/usb/gadget/at91_udc.h
@@ -0,0 +1,175 @@
+/*
+ * Copyright (C) 2004 by Thomas Rathbone, HP Labs
+ * Copyright (C) 2005 by Ivan Kokshaysky
+ * Copyright (C) 2006 by SAN People
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifndef AT91_UDC_H
+#define AT91_UDC_H
+
+/*
+ * USB Device Port (UDP) registers.
+ * Based on AT91RM9200 datasheet revision E.
+ */
+
+#define AT91_UDP_FRM_NUM 0x00 /* Frame Number Register */
+#define AT91_UDP_NUM (0x7ff << 0) /* Frame Number */
+#define AT91_UDP_FRM_ERR (1 << 16) /* Frame Error */
+#define AT91_UDP_FRM_OK (1 << 17) /* Frame OK */
+
+#define AT91_UDP_GLB_STAT 0x04 /* Global State Register */
+#define AT91_UDP_FADDEN (1 << 0) /* Function Address Enable */
+#define AT91_UDP_CONFG (1 << 1) /* Configured */
+#define AT91_UDP_ESR (1 << 2) /* Enable Send Resume */
+#define AT91_UDP_RSMINPR (1 << 3) /* Resume has been sent */
+#define AT91_UDP_RMWUPE (1 << 4) /* Remote Wake Up Enable */
+
+#define AT91_UDP_FADDR 0x08 /* Function Address Register */
+#define AT91_UDP_FADD (0x7f << 0) /* Function Address Value */
+#define AT91_UDP_FEN (1 << 8) /* Function Enable */
+
+#define AT91_UDP_IER 0x10 /* Interrupt Enable Register */
+#define AT91_UDP_IDR 0x14 /* Interrupt Disable Register */
+#define AT91_UDP_IMR 0x18 /* Interrupt Mask Register */
+
+#define AT91_UDP_ISR 0x1c /* Interrupt Status Register */
+#define AT91_UDP_EP(n) (1 << (n)) /* Endpoint Interrupt Status */
+#define AT91_UDP_RXSUSP (1 << 8) /* USB Suspend Interrupt Status */
+#define AT91_UDP_RXRSM (1 << 9) /* USB Resume Interrupt Status */
+#define AT91_UDP_EXTRSM (1 << 10) /* External Resume Interrupt Status [AT91RM9200 only] */
+#define AT91_UDP_SOFINT (1 << 11) /* Start of Frame Interrupt Status */
+#define AT91_UDP_ENDBUSRES (1 << 12) /* End of Bus Reset Interrupt Status */
+#define AT91_UDP_WAKEUP (1 << 13) /* USB Wakeup Interrupt Status [AT91RM9200 only] */
+
+#define AT91_UDP_ICR 0x20 /* Interrupt Clear Register */
+#define AT91_UDP_RST_EP 0x28 /* Reset Endpoint Register */
+
+#define AT91_UDP_CSR(n) (0x30+((n)*4)) /* Endpoint Control/Status Registers 0-7 */
+#define AT91_UDP_TXCOMP (1 << 0) /* Generates IN packet with data previously written in DPR */
+#define AT91_UDP_RX_DATA_BK0 (1 << 1) /* Receive Data Bank 0 */
+#define AT91_UDP_RXSETUP (1 << 2) /* Send STALL to the host */
+#define AT91_UDP_STALLSENT (1 << 3) /* Stall Sent / Isochronous error (Isochronous endpoints) */
+#define AT91_UDP_TXPKTRDY (1 << 4) /* Transmit Packet Ready */
+#define AT91_UDP_FORCESTALL (1 << 5) /* Force Stall */
+#define AT91_UDP_RX_DATA_BK1 (1 << 6) /* Receive Data Bank 1 */
+#define AT91_UDP_DIR (1 << 7) /* Transfer Direction */
+#define AT91_UDP_EPTYPE (7 << 8) /* Endpoint Type */
+#define AT91_UDP_EPTYPE_CTRL (0 << 8)
+#define AT91_UDP_EPTYPE_ISO_OUT (1 << 8)
+#define AT91_UDP_EPTYPE_BULK_OUT (2 << 8)
+#define AT91_UDP_EPTYPE_INT_OUT (3 << 8)
+#define AT91_UDP_EPTYPE_ISO_IN (5 << 8)
+#define AT91_UDP_EPTYPE_BULK_IN (6 << 8)
+#define AT91_UDP_EPTYPE_INT_IN (7 << 8)
+#define AT91_UDP_DTGLE (1 << 11) /* Data Toggle */
+#define AT91_UDP_EPEDS (1 << 15) /* Endpoint Enable/Disable */
+#define AT91_UDP_RXBYTECNT (0x7ff << 16) /* Number of bytes in FIFO */
+
+#define AT91_UDP_FDR(n) (0x50+((n)*4)) /* Endpoint FIFO Data Registers 0-7 */
+
+#define AT91_UDP_TXVC 0x74 /* Transceiver Control Register */
+#define AT91_UDP_TXVC_TXVDIS (1 << 8) /* Transceiver Disable */
+#define AT91_UDP_TXVC_PUON (1 << 9) /* PullUp On [AT91SAM9260 only] */
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * controller driver data structures
+ */
+
+#define NUM_ENDPOINTS 6
+
+/*
+ * hardware won't disable bus reset, or resume while the controller
+ * is suspended ... watching suspend helps keep the logic symmetric.
+ */
+#define MINIMUS_INTERRUPTUS \
+ (AT91_UDP_ENDBUSRES | AT91_UDP_RXRSM | AT91_UDP_RXSUSP)
+
+struct at91_ep {
+ struct usb_ep ep;
+ struct list_head queue;
+ struct at91_udc *udc;
+ void __iomem *creg;
+
+ unsigned maxpacket:16;
+ u8 int_mask;
+ unsigned is_pingpong:1;
+
+ unsigned stopped:1;
+ unsigned is_in:1;
+ unsigned is_iso:1;
+ unsigned fifo_bank:1;
+};
+
+struct at91_udc_caps {
+ int (*init)(struct at91_udc *udc);
+ void (*pullup)(struct at91_udc *udc, int is_on);
+};
+
+/*
+ * driver is non-SMP, and just blocks IRQs whenever it needs
+ * access protection for chip registers or driver state
+ */
+struct at91_udc {
+ struct usb_gadget gadget;
+ struct at91_ep ep[NUM_ENDPOINTS];
+ struct usb_gadget_driver *driver;
+ const struct at91_udc_caps *caps;
+ unsigned vbus:1;
+ unsigned enabled:1;
+ unsigned clocked:1;
+ unsigned suspended:1;
+ unsigned req_pending:1;
+ unsigned wait_for_addr_ack:1;
+ unsigned wait_for_config_ack:1;
+ unsigned active_suspend:1;
+ u8 addr;
+ struct at91_udc_data board;
+ struct clk *iclk, *fclk;
+ struct platform_device *pdev;
+ struct proc_dir_entry *pde;
+ void __iomem *udp_baseaddr;
+ int udp_irq;
+ spinlock_t lock;
+ struct timer_list vbus_timer;
+ struct work_struct vbus_timer_work;
+ struct regmap *matrix;
+};
+
+static inline struct at91_udc *to_udc(struct usb_gadget *g)
+{
+ return container_of(g, struct at91_udc, gadget);
+}
+
+struct at91_request {
+ struct usb_request req;
+ struct list_head queue;
+};
+
+/*-------------------------------------------------------------------------*/
+
+#ifdef VERBOSE_DEBUG
+# define VDBG DBG
+#else
+# define VDBG(stuff...) do{}while(0)
+#endif
+
+#ifdef PACKET_TRACE
+# define PACKET VDBG
+#else
+# define PACKET(stuff...) do{}while(0)
+#endif
+
+#define ERR(stuff...) pr_err("udc: " stuff)
+#define WARNING(stuff...) pr_warning("udc: " stuff)
+#define INFO(stuff...) pr_info("udc: " stuff)
+#define DBG(stuff...) pr_debug("udc: " stuff)
+
+#endif
+